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SSCAL

       SUBROUTINE  SSCAL(N,SA,SX,INCX)
       REAL SA,SX(1)
       INTEGER INCX,N
 C
 C     SCALES A VECTOR BY A CONSTANT.
 C     USES UNROLLED LOOPS FOR INCREMENT EQUAL TO 1.
 C     JACK DONGARRA, LINPACK, 3/11/78.
 C